Figure 232

Hemorrhagic alveolar capillaritis in a wedge biopsy from the lung of a patient with microscopic polyangiitis (hematoxylin and eosin). Note the neutrophils within alveolar capillaries and the massive hemorrhage into the air spaces. This pattern of injury can be seen in both microscopic polyangiitis and Wegener's granulomatosis. The pulmonary hemorrhage of anti-GBM disease usually does not have conspicuous neutrophils in alveolar capillaries.

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